keyword
MENU ▼
Read by QxMD icon Read
search

Coils

keyword
https://www.readbyqxmd.com/read/28647997/-endovascular-management-and-classification-of-the-dissecting-aneurysms-of-the-vertebral-artery
#1
Y Z Zang, Z G Wang, C W Wang, X Ding, X F Wang, L L Wang
Objective: To summarize the classifications and optimize endovascular treatment of the dissecting aneurysms of the vertebral artery (DAVA). Methods: The clinical information of 39 cases of DAVA treated with endovascular methods in our department between January 2007 and September 2016 were analyzed retrospectively.According to the location of the aneurysm in relation to the posterior inferior cerebellar artery (PICA), the aneurysms were classified into three types: type pre-PICA, located proximally to the PICA; type in-PICA, located at the PICA origin; and type post-PICA located distally to the PICA...
June 20, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28647795/investigation-of-chlorella-vulgaris-utex-265-cultivation-under-light-and-low-temperature-stressed-conditions-for-lutein-production-in-flasks-and-the-coiled-tree-photo-bioreactor-ctpbr
#2
Mengyue Gong, Amarjeet Bassi
Lutein has an increasing share in the pharmaceutical and nutraceutical market due to its benefits to eye health. Microalgae may be a potential source for lutein production while the expense limits the commercialization. In this study, a coiled tubular tree photobioreactor (CTPBR) design was investigated for cultivating the cold tolerant microalgae Chlorella vulgaris UTEX 265 under various conditions for lutein production. The influence and interaction of light irradiance strength, lighting cycle, and temperature on microalgae and lutein production efficiency at low temperature range were also studied in flasks via response surface method (RSM)...
June 24, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28647659/flow-diverters-as-a-useful-adjunct-to-traditional-endovascular-techniques-in-the-treatment-of-direct-carotid-cavernous-fistulas
#3
Christopher S Ogilvy, Rouzbeh Motiei-Langroudi, Mohammad Ghorbani, Christoph J Griessenauer, Abdulrahman Y Alturki, Ajith J Thomas
BACKGROUND: Direct carotid-cavernous sinus fistulas (CCF) are high flow arteriovenous shunts that are typically the result of a severe head injury. The endovascular treatment of these lesions includes the use of detachable balloons, coils, liquid embolic agents, and covered stents. To minimize the chance of treatment failure and subsequent complications, endoluminal reconstruction using a flow-diverting stent may be added to the treatment construct . METHODS: We present 3 cases and review the existing literature...
June 21, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28646695/pre-polarization-fields-for-earth-s-field-nmr-fast-discharge-for-use-with-short-t1-and-large-coils
#4
Mark S Conradi, Stephen A Altobelli, Nicholas J Sowko, Susan H Conradi, Eiichi Fukushima
The sensitivity of earth's field NMR is greatly increased by the use of a pre-polarizing field Bp. When used with short T1 samples, the field must be decreased rapidly to avoid loss of the pre-polarized magnetization by relaxation. Such a rapid decrease in the field requires rapid discharge (∼10ms) of a large stored magnetic field energy (∼700J). In addition, in order that the full pre-polarized magnetization be available for the subsequent pulse sequence, the field discharge should be adiabatic. This requirement is difficult to fulfill in cases where Bp is not everywhere parallel to the earth's field, such as with a large surface coil...
June 21, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28646272/rhesus-cochlear-and-vestibular-functions-are-preserved-after-inner-ear-injection-of-saline-volume-sufficient-for-gene-therapy-delivery
#5
Chenkai Dai, Mohamed Lehar, Daniel Q Sun, Lani Swarthout Rvt, John P Carey, Tim MacLachlan, Doug Brough, Hinrich Staecker, Alexandra M Della Santina, Timothy E Hullar, Charles C Della Santina
Sensorineural losses of hearing and vestibular sensation due to hair cell dysfunction are among the most common disabilities. Recent preclinical research demonstrates that treatment of the inner ear with a variety of compounds, including gene therapy agents, may elicit regeneration and/or repair of hair cells in animals exposed to ototoxic medications or other insults to the inner ear. Delivery of gene therapy may also offer a means for treatment of hereditary hearing loss. However, injection of a fluid volume sufficient to deliver an adequate dose of a pharmacologic agent could, in theory, cause inner ear trauma that compromises functional outcome...
June 23, 2017: Journal of the Association for Research in Otolaryngology: JARO
https://www.readbyqxmd.com/read/28645602/clinical-application-of-insertion-force-sensor-system-for-coil-embolization-of-intracranial-aneurysms
#6
Noriaki Matsubara, Shigeru Miyachi, Takashi Izumi, Hiroyuki Yamada, Naoki Marui, Keisuke Ota, Hayato Tajima, Kazunori Shintai, Masashi Ito, Tasuku Imai, Masahiro Nishihori, Toshihiko Wakabayashi
INTRODUCTION: In endovascular embolization for intracranial aneurysms, it is important to properly control the coil insertion force. However, the force can only be subjectively detected by the subtle feedback experienced by the neurointerventionists at their fingertips. The authors envisioned a system that would objectively sense and quantify that force. In this article, coil insertion force was measured in cases of intracranial aneurysm using this sensor, and its actual clinical application was investigated...
June 20, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28645600/newly-detected-cervical-spinal-dural-arteriovenous-fistula-on-magnetic-resonance-angiography-causing-intracranial-subarachnoid-hemorrhage-a-case-report
#7
Hiroaki Matsumoto, Hiroaki Minami, Ikuya Yamaura, Yasuhisa Yoshida, Yutaka Hirata
BACKGROUND: Although an asymptomatic spinal dural arteriovenous fistula (SDAVF) can sometimes be incidentally detected on magnetic resonance imaging (MRI), there are no previous reports showing the development of an SDAVF on MRI or magnetic resonance angiography (MRA). CASE DESCRIPTION: A 64-year old man with unruptured vertebral artery dissection (VAD) developed a subarachnoid hemorrhage (SAH) during regular follow-up. Emergent endovascular coil internal trapping for the VAD was performed...
June 20, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28645512/the-rna-seq-analysis-suggests-a-potential-multi-component-complement-system-in-oyster-crassostrea-gigas
#8
Lingling Wang, Huan Zhang, Leilei Wang, Daoxiang Zhang, Zhao Lv, Zhaoqun Liu, Weilin Wang, Zhi Zhou, Limei Qiu, Hao Wang, Jun Li, Linsheng Song
The complement system is one of the major effector mechanisms of immune system, playing essential roles in both the innate and adaptive immune responses. In the present study, the counterparts of vertebrate complement components were identified by screening the sequenced genome of Crassostrea gigas, resulting in the identification of 792 gene models containing complement-related domains. The transcriptome of haemocytes at 6, 12 and 24 h post lipopolysaccharides (LPS) stimulation showed differential expression of 77 C1q domain containing proteins, 53 C-type lectins and 42 fibrinogen-related proteins...
June 20, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28644100/influence-of-smoking-on-aneurysm-recurrence-after-endovascular-treatment-of-cerebrovascular-aneurysms
#9
John Futchko, Jordan Starr, Darryl Lau, Matthew R Leach, Christopher Roark, Aditya S Pandey, B Gregory Thompson
OBJECTIVE Smoking is a known risk factor for aneurysm development and aneurysmal subarachnoid hemorrhage, as well as subsequent vasospasm in both untreated individuals and patients who have undergone surgical clipping of cerebrovascular aneurysms. However, there is a lack of data in the current scientific literature about the long-term effects that smoking has on the integrity of endovascular repairs of cerebral aneurysms. This study was designed to determine if any smoking history increased the risk of poorer outcomes and/or aneurysm recurrence in patients who have had endovascular repair of cerebral aneurysms...
June 23, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28644003/chemical-sensor-based-upon-stress-induced-changes-in-the-permeability-of-a-magnetoelastic-wire
#10
Nahla A Hatab, Nichole A Crane, David K Mee, L Neville Howell, Larry R Mooney, Russell L Hallman, Michael J Sepaniak, Vincent E Lamberti
We introduce a chemical sensing technology, named ChIMES (Chemical Identification through Magneto-Elastic Sensing), that can detect a broad range of targets and that has the capability of untethered communication through a metallic or nonmetallic barrier. These features enable many applications in which penetrations into the sampled environment are unwanted or infeasible because of health, safety, or environmental concerns, such as following the decomposition of a dangerous material in a sealed container. The sensing element is passive and consists of a target response material hard-coupled to a magnetoelastic wire...
June 23, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28643922/speed-of-human-tooth-movement-in-growers-and-non-growers-selection-of-applied-stress-matters
#11
L R Iwasaki, Y Liu, H Liu, J C Nickel
OBJECTIVES: To test that the speed of tooth translation is not affected by stress magnitude and growth status. SETTING AND SAMPLE POPULATION: Advanced Education Orthodontic clinics at the Universities of Nebraska Medical Center and Missouri-Kansas City. Forty-six consenting subjects with orthodontic treatment plans involving maxillary first premolar extractions. MATERIALS AND METHODS: This randomized split-mouth study used segmental mechanics with definitive posterior anchorage and individual vertical-loop maxillary canine retraction appliances and measured three-dimensional tooth movements...
June 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28643359/an-open-8-channel-parallel-transmission-coil-for-static-and-dynamic-7t-mri-of-the-knee-and-ankle-joints-at-multiple-postures
#12
Jin Jin, Ewald Weber, Aurelien Destruel, Kieran O'Brien, Bassem Henin, Craig Engstrom, Stuart Crozier
PURPOSE: We present the initial in vivo imaging results of an open architecture eight-channel parallel transmission (pTx) transceive radiofrequency (RF) coil array that was designed and constructed for static and dynamic 7T MRI of the knee and ankle joints. METHODS: The pTx coil has a U-shaped dual-row configuration (200 mm overall length longitudinally) that allows static and dynamic imaging of the knee and ankle joints at various postures and during active movements...
June 22, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28642182/the-effect-of-morbid-obesity-on-subarachnoid-hemorrhage-prognosis-in-the-united-states
#13
Ross-Jordon S Elliott, Daniel Agustin Godoy, Joel E Michalek, Réza Behrouz, Marwah A Elsehety, Shaheryar Hafeez, Denise Rios, Ali Seifi
BACKGROUND: The association between obesity and non-traumatic subarachnoid hemorrhage (SAH) patient outcome is unclear. AIMS: Determine the impact of morbid obesity (body mass index ≥40 kg/m(2)) on non-traumatic SAH outcomes. METHODS: Using the Nationwide Inpatient Sample, we identified hospitalized, non-traumatic SAH patients diagnosed from 2008 to 2013 and tested the effect of obesity on their mortality and clinical outcomes. Odds ratios were estimated with a mixed effects linear logistic model with adjustment for hospital clustering...
June 19, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28642024/rtms-with-a-two-coil-array-safety-and-efficacy-for-treatment-resistant-major-depressive-disorder
#14
Linda L Carpenter, Scott T Aaronson, Gregory N Clarke, Paul E Holtzheimer, Clark W Johnson, William M McDonald, Elizabeth L Stannard, M Bret Schneider
BACKGROUND: Therapeutic repetitive Transcranial Magnetic Stimulation (rTMS) has emerged as a standard of care for individuals with major depressive disorder (MDD) who do not benefit from, or are unable to tolerate, antidepressant pharmacotherapy. Depth of stimulation is limited with currently approved figure-eight coils and larger coils capable of deeper penetration may be associated with loss of stimulation focality and undesired recruitment of motor cortex. A second generation 2-coil array rTMS system was designed to target converging brain pathways for potentially deeper prefrontal cortex stimulation...
June 9, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/28641952/the-effect-of-tissue-segmented-attenuation-maps-on-pet-quantification-with-a-special-focus-on-large-arteries
#15
A Mota-Cobian, J C Alonso-Farto, L Fernández-Friera, J Sánchez-González, B López-Melgar, L J Jiménez-Borreguero, V Fuster, J Ruiz-Cabello, S España
OBJECTIVES: Accuracy on quantitative PET image analysis relies on the correct application of attenuation correction which is one of the major challenges for PET/MRI that remains to be solved. The purpose of this study is to evaluate the effect of MRI-based attenuation maps and the use of flexible coils on the quantitative accuracy of PET images with a special focus on large arteries. MATERIALS AND METHODS: PET/CT data from eight oncologic patients was used. PET data was reconstructed using attenuation maps with different level of detail emulating several approaches available on current PET/MRI scanners...
June 19, 2017: Revista Española de Medicina Nuclear e Imagen Molecular
https://www.readbyqxmd.com/read/28640923/how-much-detail-is-needed-in-modeling-a-transcranial-magnetic-stimulation-figure-8-coil-measurements-and-brain-simulations
#16
Petar I Petrov, Stefano Mandija, Iris E C Sommer, Cornelis A T van den Berg, Sebastiaan F W Neggers
BACKGROUND: Despite TMS wide adoption, its spatial and temporal patterns of neuronal effects are not well understood. Although progress has been made in predicting induced currents in the brain using realistic finite element models (FEM), there is little consensus on how a magnetic field of a typical TMS coil should be modeled. Empirical validation of such models is limited and subject to several limitations. METHODS: We evaluate and empirically validate models of a figure-of-eight TMS coil that are commonly used in published modeling studies, of increasing complexity: simple circular coil model; coil with in-plane spiral winding turns; and finally one with stacked spiral winding turns...
2017: PloS One
https://www.readbyqxmd.com/read/28640593/dna-condensation-induced-by-a-star-shaped-hexameric-cationic-surfactant
#17
Yaxun Fan, Hua Wang, Chengqian He, Fulin Qiao, Shu Wang, Yilin Wang
The interactions between a star-shaped hexameric cationic quaternary ammonium surfactant PAHB and calf thymus DNA and induced DNA condensation were investigated by ζ-potential, dynamic light scattering, atomic force microscopy, isothermal titration calorimetry, ethidium bromide exclusion assay, circular dichroism and cytotoxicity assay. With the addition of PAHB, long extended DNA molecules exhibit successive conformational transitions from elongated coil to partially condensed cluster-like aggregate, globules-on-a-string structure, and then to fully condensed globule until the saturation point of interaction between PAHB and DNA, which is slightly above their charge neutralization point...
June 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28639791/insight-into-the-final-step-of-the-supramolecular-buildup-of-eumelanin
#18
Anne Büngeler, Benjamin Hämisch, Klaus Huber, Wolfgang Bremser, Oliver Ingolf Strube
The final step in the supramolecular buildup of eumelanin particles is investigated regarding involved species and mechanism. Time resolved in situ light scattering and scanning electron microscopy reveal an aggregation of particles with narrow size distribution around 40 nm, previously only observed as substructures. These form larger particles with again very uniform size and diameters around 200 nm. Aggregation of each single particle takes only a few minutes to complete, whereas the entire process goes on for at least three hours, partly due to kinetics of the precursors...
June 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28639674/transition-from-disordered-aggregates-to-ordered-lattices-kinetic-control-of-the-assembly-of-a-computationally-designed-peptide
#19
Yu Tian, Huixi Violet Zhang, Kristi L Kiick, Jeffery G Saven, Darrin J Pochan
Natural biomolecular self-assembly typically occurs under a narrow range of solution conditions, and the design of sequences that can form prescribed structures under a range of such conditions would be valuable in the bottom-up assembly of predetermined nanostructures. We present a computationally designed peptide that robustly self-assembles into regular arrays under a wide range of solution pH and temperature conditions. Controling the solution conditions provides the opportunity to exploit a simple and reproducible approach for altering the pathway of peptide solution self-assembly...
June 22, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28639435/bioinspired-microfibers-with-embedded-perfusable-helical-channels
#20
Peidi Xu, Ruoxiao Xie, Yupeng Liu, Guoan Luo, Mingyu Ding, Qionglin Liang
Materials with microchannels have attracted increasing attention due to their promising perfusability and biomimetic geometry. However, the fabrication of microfibers with more geometrically complex channels in the micro- or nanoscale remains a big challenge. Here, a novel method for generating scalable microfibers with consecutive embedded helical channels is presented using an easily made coaxial microfluidic device. The characteristics of the helical channel can be accurately controlled by simply adjusting the flow rate ratio of the fluids...
June 22, 2017: Advanced Materials
keyword
keyword
55953
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"